Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativus L.) seedlings in hydroponics(Plant nutrition)

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概要

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• The nutrient uptake and allocation of cucumber (Cucumis sativus L.) seedlings at different root-zone temperatures (RZT) and different concentrations of nitrogen (N), phosphorus (P), and potassium (K) nutrients were examined. Plants were grown in a nutrient solution for 30d at two root-zone temperatures (a diurnally fluctuating ambient 10℃-RZT and a constant 20℃-RZT) with the aerial parts of the plants maintained at ambient temperature (10℃-30℃). Based on a Hoagland nutrient solution, seven N, P, and K nutrient concentrations were supplied to the plants at each RZT. Results showed that total plant and shoot dry weights under each nutrient treatment were significantly lower at low root-zone temperature (10℃-RZT) than at elevated root-zone temperature (20℃-RZT). But higher root dry weights were obtained at 10℃-RZT than those at 20℃-RZT. Total plant dry weights at both 10℃-RZT and 20℃-RZT were increased with increased solution N concentration, but showed different responses under P and K treatments. All estimated nutrient concentrations (N, P, and K) and uptake by the plant were obviously influenced by RZT. Low root temperature (10℃-RZT) caused a remarkable reduction in total N, P, and K uptake of shoots in all nutrient treatments, and more nutrients were accumulated in roots at 10℃-RZT than those at 20℃-RZT. N, P, and K uptakes and distribution ratios in shoots were both improved at elevated root-zone temperature (20℃-RZT). N supplies were favorable to P and K uptake at both 10℃-RZT and 20℃-RZT, with no significantly positive correlation between N and P, or N and K uptake. In conclusion, higher RZT was more beneficial to increase of plant biomass and mineral nutrient absorption than was increase of nutrient concentration. Among the three element nutrients, increasing N nutrient concentration in solution promoted better tolerance to low RZT in cucumber seedlings than increasing P and K. In addition, appropriately decreased P concentration favors plant growth.

• 2012-12-00

著者

• Li Xun

  State Key Lab Of Superhard Materials Institute Of Atomic And Molecular Physics Jilin University

• DONG Fei

  Agricultural Bureau of Xiangfen County

• LI Xun

  State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences

• DUAN Zengqiang

  State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences

• MAO Jingdong

  Department of Chemistry and Biochemistry, Old Dominion University

• YAN Qiuyan

  State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences

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• Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativus L.) seedlings in hydroponics(Plant nutrition)
• Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativus L.) seedlings in hydroponics

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